BERKSHIRE PRODUCTS PC Watchdog, Руководство по оборудованию, Страница: 9 / 19

3.5 Switch #4 - Over- temp Reset
If this switch is on then the Watchdog will reset and hold the reset on a PC during an over-temp
condition. The first trip point is
46
°
C (115
°
F) at which point the buzzer will start to sound. The second
trip point where the Watchdog can reset the PC is 56
°
C (133
°
F). If the Watchdog resets the PC, it will
remain in reset until the temperature drops back below 50
°
C (122
°
F). There is a software option to
allow shifting the trip points higher via software control. The trip points can be increased in 1
°
C
increments up to 77
°
C ( 171
°
F) and 87
°
C (189
°
F).
3.6 Switch #5 - Power On Delay (POD)
After a power up or a PC reset the Watchdog normally waits 2.5 minutes to allow the PC to re-boot.
This time can be shortened in software Command Mode. Sometimes the PC will require more than 2.5
minutes to complete the re-boot, which can be accommodated by turning on this switch.
In Passive or Active Mode the Watchdog will delay starting the timeout counter until it "sees" the first
activity in either of these modes.
** NOTE ** - Be Careful with this switch. If it is on and the PC locks up during reset then the board
would not get “tickled” since no program would load. This would leave the PC permanently
frozen. A better option is to store a longer POD time in non-volatile memory.
3.7 Switches #6-8 - Watchdog Delay Time
These switches set the delay time until the watchdog resets the PC. As long as the watchdog is
receiving re-trigger pulses it will continue to reset the delay time. The settings and times are shown
below:
Switches 6-8 Delay Time Switches 6-8 Delay Time
OFF-OFF-OFF 5 Seconds ON-OFF-OFF 5 Minutes
OFF-OFF-ON 10 Seconds ON-OFF-ON 10 Minutes
OFF-ON-OFF 30 Seconds ON-ON-OFF 30 Minutes
OFF-ON-ON 1 Minutes ON-ON-ON 1 Hour
These times can be overridden with other delays by a user program.
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